What would you do?

[walter]

AAU game, regional final. First half, 1 point game. Team A scores a goal. B1 steps out of bounds (both feet out) as she is her team's designated inbounder. She doesn't have the ball with her. One of her teammates taps the ball toward B1 who fails to cleanly catch the ball and it bobbles/hits off of her hands, hits the floor inbounds and bounces towards a player from team A who will have an uncontested layup if she gets the ball. B1 steps inbounds, dives, and taps the ball away from A1 toward a team B player. What's the call? After some responses I tell you how we handled it.